libbinder: build Trusty files on Android

Build the Trusty source code on Android as the
libbinder_on_trusty_mock library so that we can catch
Trusty build errors early.

Bug: 230135749
Test: m libbinder_on_trusty_mock
Change-Id: Iedfff0e76582ff8de55be652cb4330369386cd52
diff --git a/libs/binder/tests/Android.bp b/libs/binder/tests/Android.bp
index 1babfd5..e460d2c 100644
--- a/libs/binder/tests/Android.bp
+++ b/libs/binder/tests/Android.bp
@@ -341,6 +341,11 @@
         "binderRpcTest_shared_defaults",
         "libbinder_tls_shared_deps",
     ],
+
+    // Add the Trusty mock library as a fake dependency so it gets built
+    required: [
+        "libbinder_on_trusty_mock",
+    ],
 }
 
 cc_test {